@article{10_4064_sm189_3_3,
     author = {Krzysztof Bogdan and Wolfhard Hansen and Tomasz Jakubowski},
     title = {Time-dependent {Schr\"odinger} perturbations of
 transition densities},
     journal = {Studia Mathematica},
     pages = {235--254},
     publisher = {mathdoc},
     volume = {189},
     number = {3},
     year = {2008},
     doi = {10.4064/sm189-3-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm189-3-3/}
}